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3520 Phenolic paper Lamianted tube

1 .Description: Phenolic Paper Laminated Tube Made from paper that impregnated with phenolic resin under pressure and heat. With high mechanical strength and electrical properties,,
1).Outer diameter: 10-300 mm
2).Wall thickness: 1-50 mm
3).Length: 1000mm
4).Technical data sheet available
5). Thermal grade is class E.
3.Color: Brown, orange
4. Application: It is used for the insulating spare parts of the electrical appliances and transformers, also used under humidity environment and transformer oil.


Unit Grade
3520 Phenolic Paper Laminate Tube
Inside diameter(5-25mm) Inside diameter (>25mm)
Density g/cm3 ≥1.03 ≥1.10
Water absorption rate   % Wall thickness 3mm   ≤8
Thermostability(24h) °C 120 120
Flexural strength MPa ≥50.0 ≥60.0
Compressive strength MPa ≥50.0 ≥60.0
Shear strength MPa
Dissipation factor 50Hz   ≤0.03 ≤0.03
Dielectric strength perpendicular to laminations(withstand voltage) kV/mm Wall thickness 1.5-2.5mm ≥8.5 ≥8.5
(in 90±2°C/5min transformer oil) >2.5-3.5mm ≥8.0 ≥8.0
>3.5-4.5mm ≥7.0 ≥7.0
>4.5-6mm ≥6.5 ≥6.5
>6-9mm ≥6.0 ≥6.0
Dielectric breakdown parallel to laminations (in 90±2°C/5min transformer oil) kV   20   25
Surface withstand voltage (in case of humidity, under normal condition air withstand voltage 1 min) kV   12   12
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